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+/*
+ * Copyright (c) 2009-2021, Redis Labs Ltd.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * * Neither the name of Redis nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* ----------------------------------------------------------------------------------------
+ * A RESP parser for parsing replies returned by RM_Call or Lua's
+ * 'redis.call()'.
+ *
+ * The parser introduces callbacks that need to be set by the user. Each
+ * callback represents a different reply type. Each callback gets a p_ctx that
+ * was given to the parseReply function. The callbacks also give the protocol
+ * (underlying blob) of the current reply and the size.
+ *
+ * Some callbacks also get the parser object itself:
+ * - array_callback
+ * - set_callback
+ * - map_callback
+ *
+ * These callbacks need to continue parsing by calling parseReply a number of
+ * times, according to the supplied length. Subsequent parseReply calls may use
+ * a different p_ctx, which will be used for nested CallReply objects.
+ *
+ * These callbacks also do not receive a proto_len, which is not known at the
+ * time of parsing. Callers may calculate it themselves after parsing the
+ * entire collection.
+ *
+ * NOTE: This parser is designed to only handle replies generated by Redis
+ * itself. It does not perform many required validations and thus NOT SAFE FOR
+ * PARSING USER INPUT.
+ * ----------------------------------------------------------------------------------------
+ */
+
+#include "resp_parser.h"
+#include "server.h"
+
+static int parseBulk(ReplyParser *parser, void *p_ctx) {
+ const char *proto = parser->curr_location;
+ char *p = strchr(proto+1,'\r');
+ long long bulklen;
+ parser->curr_location = p + 2; /* for \r\n */
+
+ string2ll(proto+1,p-proto-1,&bulklen);
+ if (bulklen == -1) {
+ parser->callbacks.null_bulk_string_callback(p_ctx, proto, parser->curr_location - proto);
+ } else {
+ const char *str = parser->curr_location;
+ parser->curr_location += bulklen;
+ parser->curr_location += 2; /* for \r\n */
+ parser->callbacks.bulk_string_callback(p_ctx, str, bulklen, proto, parser->curr_location - proto);
+ }
+
+ return C_OK;
+}
+
+static int parseSimpleString(ReplyParser *parser, void *p_ctx) {
+ const char *proto = parser->curr_location;
+ char *p = strchr(proto+1,'\r');
+ parser->curr_location = p + 2; /* for \r\n */
+ parser->callbacks.simple_str_callback(p_ctx, proto+1, p-proto-1, proto, parser->curr_location - proto);
+ return C_OK;
+}
+
+static int parseError(ReplyParser *parser, void *p_ctx) {
+ const char *proto = parser->curr_location;
+ char *p = strchr(proto+1,'\r');
+ parser->curr_location = p + 2; // for \r\n
+ parser->callbacks.error_callback(p_ctx, proto+1, p-proto-1, proto, parser->curr_location - proto);
+ return C_OK;
+}
+
+static int parseLong(ReplyParser *parser, void *p_ctx) {
+ const char *proto = parser->curr_location;
+ char *p = strchr(proto+1,'\r');
+ parser->curr_location = p + 2; /* for \r\n */
+ long long val;
+ string2ll(proto+1,p-proto-1,&val);
+ parser->callbacks.long_callback(p_ctx, val, proto, parser->curr_location - proto);
+ return C_OK;
+}
+
+static int parseAttributes(ReplyParser *parser, void *p_ctx) {
+ const char *proto = parser->curr_location;
+ char *p = strchr(proto+1,'\r');
+ long long len;
+ string2ll(proto+1,p-proto-1,&len);
+ p += 2;
+ parser->curr_location = p;
+ parser->callbacks.attribute_callback(parser, p_ctx, len, proto);
+ return C_OK;
+}
+
+static int parseVerbatimString(ReplyParser *parser, void *p_ctx) {
+ const char *proto = parser->curr_location;
+ char *p = strchr(proto+1,'\r');
+ long long bulklen;
+ parser->curr_location = p + 2; /* for \r\n */
+ string2ll(proto+1,p-proto-1,&bulklen);
+ const char *format = parser->curr_location;
+ parser->curr_location += bulklen;
+ parser->curr_location += 2; /* for \r\n */
+ parser->callbacks.verbatim_string_callback(p_ctx, format, format + 4, bulklen - 4, proto, parser->curr_location - proto);
+ return C_OK;
+}
+
+static int parseBigNumber(ReplyParser *parser, void *p_ctx) {
+ const char *proto = parser->curr_location;
+ char *p = strchr(proto+1,'\r');
+ parser->curr_location = p + 2; /* for \r\n */
+ parser->callbacks.big_number_callback(p_ctx, proto+1, p-proto-1, proto, parser->curr_location - proto);
+ return C_OK;
+}
+
+static int parseNull(ReplyParser *parser, void *p_ctx) {
+ const char *proto = parser->curr_location;
+ char *p = strchr(proto+1,'\r');
+ parser->curr_location = p + 2; /* for \r\n */
+ parser->callbacks.null_callback(p_ctx, proto, parser->curr_location - proto);
+ return C_OK;
+}
+
+static int parseDouble(ReplyParser *parser, void *p_ctx) {
+ const char *proto = parser->curr_location;
+ char *p = strchr(proto+1,'\r');
+ parser->curr_location = p + 2; /* for \r\n */
+ char buf[MAX_LONG_DOUBLE_CHARS+1];
+ size_t len = p-proto-1;
+ double d;
+ if (len <= MAX_LONG_DOUBLE_CHARS) {
+ memcpy(buf,proto+1,len);
+ buf[len] = '\0';
+ d = strtod(buf,NULL); /* We expect a valid representation. */
+ } else {
+ d = 0;
+ }
+ parser->callbacks.double_callback(p_ctx, d, proto, parser->curr_location - proto);
+ return C_OK;
+}
+
+static int parseBool(ReplyParser *parser, void *p_ctx) {
+ const char *proto = parser->curr_location;
+ char *p = strchr(proto+1,'\r');
+ parser->curr_location = p + 2; /* for \r\n */
+ parser->callbacks.bool_callback(p_ctx, proto[1] == 't', proto, parser->curr_location - proto);
+ return C_OK;
+}
+
+static int parseArray(ReplyParser *parser, void *p_ctx) {
+ const char *proto = parser->curr_location;
+ char *p = strchr(proto+1,'\r');
+ long long len;
+ string2ll(proto+1,p-proto-1,&len);
+ p += 2;
+ parser->curr_location = p;
+ if (len == -1) {
+ parser->callbacks.null_array_callback(p_ctx, proto, parser->curr_location - proto);
+ } else {
+ parser->callbacks.array_callback(parser, p_ctx, len, proto);
+ }
+ return C_OK;
+}
+
+static int parseSet(ReplyParser *parser, void *p_ctx) {
+ const char *proto = parser->curr_location;
+ char *p = strchr(proto+1,'\r');
+ long long len;
+ string2ll(proto+1,p-proto-1,&len);
+ p += 2;
+ parser->curr_location = p;
+ parser->callbacks.set_callback(parser, p_ctx, len, proto);
+ return C_OK;
+}
+
+static int parseMap(ReplyParser *parser, void *p_ctx) {
+ const char *proto = parser->curr_location;
+ char *p = strchr(proto+1,'\r');
+ long long len;
+ string2ll(proto+1,p-proto-1,&len);
+ p += 2;
+ parser->curr_location = p;
+ parser->callbacks.map_callback(parser, p_ctx, len, proto);
+ return C_OK;
+}
+
+/* Parse a reply pointed to by parser->curr_location. */
+int parseReply(ReplyParser *parser, void *p_ctx) {
+ switch (parser->curr_location[0]) {
+ case '$': return parseBulk(parser, p_ctx);
+ case '+': return parseSimpleString(parser, p_ctx);
+ case '-': return parseError(parser, p_ctx);
+ case ':': return parseLong(parser, p_ctx);
+ case '*': return parseArray(parser, p_ctx);
+ case '~': return parseSet(parser, p_ctx);
+ case '%': return parseMap(parser, p_ctx);
+ case '#': return parseBool(parser, p_ctx);
+ case ',': return parseDouble(parser, p_ctx);
+ case '_': return parseNull(parser, p_ctx);
+ case '(': return parseBigNumber(parser, p_ctx);
+ case '=': return parseVerbatimString(parser, p_ctx);
+ case '|': return parseAttributes(parser, p_ctx);
+ default: if (parser->callbacks.error) parser->callbacks.error(p_ctx);
+ }
+ return C_ERR;
+}
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